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Last updated on April 16, 2014 at 14:04 EDT

Goliath Frog, Conraua goliath

The Goliath Frog (Conraua goliath) is the largest living anuran on Earth. The largest known specimens can grow up to 13 inches long from snout to vent, and weighs up to 7 pounds. This animal has a relatively small habitat range, mainly in Cameroon and Equatorial Guinea. Its numbers are decreasing because of habitat destruction and its collection for consumption and the pet trade.

Their eyes can be almost .98 inches in diameter. The obvious tympanum has a diameter of about .20 inches and is separated from the eye by about 2 inches in the adults.

A lateral fold stretches from the eye to the posterior portion of the tympanum. The toes are fully webbed, with large interdigital membranes stretching down to the toe tips. The second toe is the longest. The skin on the dorsum and on top of the limbs are granular. Dorsal coloration is green sienna, while the abdomen and ventral part of the limbs are a yellow/orange. They have acute hearing but no vocal sac, and they also lack nuptial pads.

This frog is normally found in and near fast-flowing rivers with sandy bottoms in the Middle African countries of Cameroon and Equatorial Guinea. These rivers and normally clear an highly oxygenated. Their actual range spans from the last 120 miles of the Sanaga basin in Cameroon to the north to the last 31 miles of the Benito River basin in Equatorial Guinea to the south. The river systems in which these frogs live are frequently found in dense, extremely humid areas with relatively high temperatures.

Like most amphibians, water is important for their reproduction. Due to the frog lacking a vocal sac, it doesn’t produce mating calls, a behavior unusually absent among frogs and toads. Males construct spawning and breeding areas alongside and in rivers by pushing rocks into semicircular patterns. The egg masses are made up of several hundred eggs, about 3.5 millimeters each, attached to vegetation at the bottom of rivers. Larval development takes between 85 and 95 days.

These tadpoles are vegetarian and feed on a single aquatic plant. Adult Goliath Frogs feed on worms, and insects. They also eat smaller frogs, crabs, baby turtles, and young snakes.

It can live up to fifty years while in the wild. It is preyed up on by snakes, Nile crocodiles, and Nile monitors.

Image Caption: Goliathfrosch (Conraua goliath). Credit: Ryan Somma/Wikipedia (CC BY-SA 2.0)

Goliath Frog Conraua goliath